1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * TI LP8501 9 channel LED Driver 4 * 5 * Copyright (C) 2013 Texas Instruments 6 * 7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com> 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/firmware.h> 12 #include <linux/i2c.h> 13 #include <linux/init.h> 14 #include <linux/leds.h> 15 #include <linux/module.h> 16 #include <linux/mutex.h> 17 #include <linux/of.h> 18 #include <linux/platform_data/leds-lp55xx.h> 19 #include <linux/slab.h> 20 21 #include "leds-lp55xx-common.h" 22 23 #define LP8501_PAGES_PER_ENGINE 1 24 #define LP8501_MAX_LEDS 9 25 26 /* Registers */ 27 #define LP8501_REG_ENABLE 0x00 28 #define LP8501_ENABLE BIT(6) 29 30 #define LP8501_REG_OP_MODE 0x01 31 32 #define LP8501_REG_PWR_CONFIG 0x05 33 #define LP8501_PWR_CONFIG_M 0x03 34 35 #define LP8501_REG_LED_PWM_BASE 0x16 36 37 #define LP8501_REG_LED_CURRENT_BASE 0x26 38 39 #define LP8501_REG_CONFIG 0x36 40 #define LP8501_PWM_PSAVE BIT(7) 41 #define LP8501_AUTO_INC BIT(6) 42 #define LP8501_PWR_SAVE BIT(5) 43 #define LP8501_CP_MODE_MASK 0x18 44 #define LP8501_CP_MODE_SHIFT 3 45 #define LP8501_INT_CLK BIT(0) 46 #define LP8501_DEFAULT_CFG (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE) 47 48 #define LP8501_REG_STATUS 0x3A 49 #define LP8501_ENGINE_BUSY BIT(4) 50 51 #define LP8501_REG_RESET 0x3D 52 #define LP8501_RESET 0xFF 53 54 #define LP8501_REG_PROG_MEM 0x50 55 56 static int lp8501_post_init_device(struct lp55xx_chip *chip) 57 { 58 int ret; 59 u8 val = LP8501_DEFAULT_CFG; 60 61 ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE); 62 if (ret) 63 return ret; 64 65 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 66 usleep_range(1000, 2000); 67 68 if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT) 69 val |= LP8501_INT_CLK; 70 71 val |= (chip->pdata->charge_pump_mode << LP8501_CP_MODE_SHIFT) & LP8501_CP_MODE_MASK; 72 73 ret = lp55xx_write(chip, LP8501_REG_CONFIG, val); 74 if (ret) 75 return ret; 76 77 /* Power selection for each output */ 78 return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG, 79 LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel); 80 } 81 82 static void lp8501_run_engine(struct lp55xx_chip *chip, bool start) 83 { 84 /* stop engine */ 85 if (!start) { 86 lp55xx_stop_all_engine(chip); 87 lp55xx_turn_off_channels(chip); 88 return; 89 } 90 91 lp55xx_run_engine_common(chip); 92 } 93 94 /* Chip specific configurations */ 95 static struct lp55xx_device_config lp8501_cfg = { 96 .reg_op_mode = { 97 .addr = LP8501_REG_OP_MODE, 98 }, 99 .reg_exec = { 100 .addr = LP8501_REG_ENABLE, 101 }, 102 .engine_busy = { 103 .addr = LP8501_REG_STATUS, 104 .mask = LP8501_ENGINE_BUSY, 105 }, 106 .reset = { 107 .addr = LP8501_REG_RESET, 108 .val = LP8501_RESET, 109 }, 110 .enable = { 111 .addr = LP8501_REG_ENABLE, 112 .val = LP8501_ENABLE, 113 }, 114 .prog_mem_base = { 115 .addr = LP8501_REG_PROG_MEM, 116 }, 117 .reg_led_pwm_base = { 118 .addr = LP8501_REG_LED_PWM_BASE, 119 }, 120 .reg_led_current_base = { 121 .addr = LP8501_REG_LED_CURRENT_BASE, 122 }, 123 .pages_per_engine = LP8501_PAGES_PER_ENGINE, 124 .max_channel = LP8501_MAX_LEDS, 125 .post_init_device = lp8501_post_init_device, 126 .brightness_fn = lp55xx_led_brightness, 127 .set_led_current = lp55xx_set_led_current, 128 .firmware_cb = lp55xx_firmware_loaded_cb, 129 .run_engine = lp8501_run_engine, 130 }; 131 132 static const struct i2c_device_id lp8501_id[] = { 133 { "lp8501", .driver_data = (kernel_ulong_t)&lp8501_cfg, }, 134 { } 135 }; 136 MODULE_DEVICE_TABLE(i2c, lp8501_id); 137 138 static const struct of_device_id of_lp8501_leds_match[] = { 139 { .compatible = "ti,lp8501", .data = &lp8501_cfg, }, 140 {}, 141 }; 142 143 MODULE_DEVICE_TABLE(of, of_lp8501_leds_match); 144 145 static struct i2c_driver lp8501_driver = { 146 .driver = { 147 .name = "lp8501", 148 .of_match_table = of_lp8501_leds_match, 149 }, 150 .probe = lp55xx_probe, 151 .remove = lp55xx_remove, 152 .id_table = lp8501_id, 153 }; 154 155 module_i2c_driver(lp8501_driver); 156 157 MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver"); 158 MODULE_AUTHOR("Milo Kim"); 159 MODULE_LICENSE("GPL"); 160